Finding the Fourth Proportional to 713,820.78, 1,069,303.59 and 429,354.25

Step by Step Solution

1. Step 1: Write the proportion equation
   713,820.78 : 1,069,303.59 = 429,354.25 : x
2. Step 2: Convert to fraction form
   713,820.78/1,069,303.59 = 429,354.25/x
3. Step 3: Cross multiply
   713,820.78x = 1,069,303.59 × 429,354.25
4. Step 4: Simplify right side
   713,820.78x = 459,110,040,906.76
5. Step 5: Solve for x
   x = 459,110,040,906.76/713,820.78
6. Step 6: Final answer
   x = 643,172.70