Finding the Fourth Proportional to 742,978.31, 1,025,290.31 and 420,719.00

Step by Step Solution

1. Step 1: Write the proportion equation
   742,978.31 : 1,025,290.31 = 420,719.00 : x
2. Step 2: Convert to fraction form
   742,978.31/1,025,290.31 = 420,719.00/x
3. Step 3: Cross multiply
   742,978.31x = 1,025,290.31 × 420,719.00
4. Step 4: Simplify right side
   742,978.31x = 431,359,106,702.84
5. Step 5: Solve for x
   x = 431,359,106,702.84/742,978.31
6. Step 6: Final answer
   x = 580,581.03