Finding the Fourth Proportional to 567,605.31, 783,300.63 and 312,965.55

Step by Step Solution

1. Step 1: Write the proportion equation
   567,605.31 : 783,300.63 = 312,965.55 : x
2. Step 2: Convert to fraction form
   567,605.31/783,300.63 = 312,965.55/x
3. Step 3: Cross multiply
   567,605.31x = 783,300.63 × 312,965.55
4. Step 4: Simplify right side
   567,605.31x = 245,146,112,483.30
5. Step 5: Solve for x
   x = 245,146,112,483.30/567,605.31
6. Step 6: Final answer
   x = 431,895.38