Finding the Fourth Proportional to 1,041.52, 1,561.86 and 521.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,041.52 : 1,561.86 = 521.34 : x
2. Step 2: Convert to fraction form
   1,041.52/1,561.86 = 521.34/x
3. Step 3: Cross multiply
   1,041.52x = 1,561.86 × 521.34
4. Step 4: Simplify right side
   1,041.52x = 814,260.09
5. Step 5: Solve for x
   x = 814,260.09/1,041.52
6. Step 6: Final answer
   x = 781.80