Finding the Fourth Proportional to 1,092.31, 1,507.40 and 620.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.31 : 1,507.40 = 620.17 : x
2. Step 2: Convert to fraction form
   1,092.31/1,507.40 = 620.17/x
3. Step 3: Cross multiply
   1,092.31x = 1,507.40 × 620.17
4. Step 4: Simplify right side
   1,092.31x = 934,839.71
5. Step 5: Solve for x
   x = 934,839.71/1,092.31
6. Step 6: Final answer
   x = 855.84