Finding the Fourth Proportional to 85,142.52, 117,510.66 and 64,961.24

Step by Step Solution

1. Step 1: Write the proportion equation
   85,142.52 : 117,510.66 = 64,961.24 : x
2. Step 2: Convert to fraction form
   85,142.52/117,510.66 = 64,961.24/x
3. Step 3: Cross multiply
   85,142.52x = 117,510.66 × 64,961.24
4. Step 4: Simplify right side
   85,142.52x = 7,633,638,186.82
5. Step 5: Solve for x
   x = 7,633,638,186.82/85,142.52
6. Step 6: Final answer
   x = 89,657.18