Finding the Fourth Proportional to 1,139.31, 1,567.30 and 929.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.31 : 1,567.30 = 929.02 : x
2. Step 2: Convert to fraction form
   1,139.31/1,567.30 = 929.02/x
3. Step 3: Cross multiply
   1,139.31x = 1,567.30 × 929.02
4. Step 4: Simplify right side
   1,139.31x = 1,456,053.05
5. Step 5: Solve for x
   x = 1,456,053.05/1,139.31
6. Step 6: Final answer
   x = 1,278.01