Finding the Fourth Proportional to 429,381,036.10, 644,071,554.15 and 429,381,036.10

Step by Step Solution

1. Step 1: Write the proportion equation
   429,381,036.10 : 644,071,554.15 = 429,381,036.10 : x
2. Step 2: Convert to fraction form
   429,381,036.10/644,071,554.15 = 429,381,036.10/x
3. Step 3: Cross multiply
   429,381,036.10x = 644,071,554.15 × 429,381,036.10
4. Step 4: Simplify right side
   429,381,036.10x = 276,552,111,243,464,256
5. Step 5: Solve for x
   x = 276,552,111,243,464,256/429,381,036.10
6. Step 6: Final answer
   x = 644,071,554.15