Finding the Fourth Proportional to 1,328,540.09, 1,993,126.34 and 429,981.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,328,540.09 : 1,993,126.34 = 429,981.83 : x
2. Step 2: Convert to fraction form
   1,328,540.09/1,993,126.34 = 429,981.83/x
3. Step 3: Cross multiply
   1,328,540.09x = 1,993,126.34 × 429,981.83
4. Step 4: Simplify right side
   1,328,540.09x = 857,008,111,094.40
5. Step 5: Solve for x
   x = 857,008,111,094.40/1,328,540.09
6. Step 6: Final answer
   x = 645,075.08