Finding the Fourth Proportional to 1,076.86, 1,615.16 and 521.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.86 : 1,615.16 = 521.98 : x
2. Step 2: Convert to fraction form
   1,076.86/1,615.16 = 521.98/x
3. Step 3: Cross multiply
   1,076.86x = 1,615.16 × 521.98
4. Step 4: Simplify right side
   1,076.86x = 843,081.22
5. Step 5: Solve for x
   x = 843,081.22/1,076.86
6. Step 6: Final answer
   x = 782.91