Finding the Fourth Proportional to 7,978.77, 11,010.87 and 5,252.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,978.77 : 11,010.87 = 5,252.31 : x
2. Step 2: Convert to fraction form
   7,978.77/11,010.87 = 5,252.31/x
3. Step 3: Cross multiply
   7,978.77x = 11,010.87 × 5,252.31
4. Step 4: Simplify right side
   7,978.77x = 57,832,502.61
5. Step 5: Solve for x
   x = 57,832,502.61/7,978.77
6. Step 6: Final answer
   x = 7,248.30