Finding the Fourth Proportional to 1,013.72, 1,521.41 and 526.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,013.72 : 1,521.41 = 526.91 : x
2. Step 2: Convert to fraction form
   1,013.72/1,521.41 = 526.91/x
3. Step 3: Cross multiply
   1,013.72x = 1,521.41 × 526.91
4. Step 4: Simplify right side
   1,013.72x = 801,635.90
5. Step 5: Solve for x
   x = 801,635.90/1,013.72
6. Step 6: Final answer
   x = 790.79