Finding the Fourth Proportional to 1,111.80, 1,666.47 and 526.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.80 : 1,666.47 = 526.17 : x
2. Step 2: Convert to fraction form
   1,111.80/1,666.47 = 526.17/x
3. Step 3: Cross multiply
   1,111.80x = 1,666.47 × 526.17
4. Step 4: Simplify right side
   1,111.80x = 876,846.52
5. Step 5: Solve for x
   x = 876,846.52/1,111.80
6. Step 6: Final answer
   x = 788.67