Finding the Fourth Proportional to 1,111.47, 1,666.50 and 591.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.47 : 1,666.50 = 591.15 : x
2. Step 2: Convert to fraction form
   1,111.47/1,666.50 = 591.15/x
3. Step 3: Cross multiply
   1,111.47x = 1,666.50 × 591.15
4. Step 4: Simplify right side
   1,111.47x = 985,151.48
5. Step 5: Solve for x
   x = 985,151.48/1,111.47
6. Step 6: Final answer
   x = 886.35