Finding the Fourth Proportional to 928,945.56, 1,281,959.82 and 521,138.10

Step by Step Solution

1. Step 1: Write the proportion equation
   928,945.56 : 1,281,959.82 = 521,138.10 : x
2. Step 2: Convert to fraction form
   928,945.56/1,281,959.82 = 521,138.10/x
3. Step 3: Cross multiply
   928,945.56x = 1,281,959.82 × 521,138.10
4. Step 4: Simplify right side
   928,945.56x = 668,078,104,871.14
5. Step 5: Solve for x
   x = 668,078,104,871.14/928,945.56
6. Step 6: Final answer
   x = 719,178.96