Finding the Fourth Proportional to 1,008.47, 1,390.71 and 654.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,008.47 : 1,390.71 = 654.52 : x
2. Step 2: Convert to fraction form
   1,008.47/1,390.71 = 654.52/x
3. Step 3: Cross multiply
   1,008.47x = 1,390.71 × 654.52
4. Step 4: Simplify right side
   1,008.47x = 910,240.56
5. Step 5: Solve for x
   x = 910,240.56/1,008.47
6. Step 6: Final answer
   x = 902.60