Finding the Fourth Proportional to 118,686.87, 163,787.86 and 64,971.92

Step by Step Solution

1. Step 1: Write the proportion equation
   118,686.87 : 163,787.86 = 64,971.92 : x
2. Step 2: Convert to fraction form
   118,686.87/163,787.86 = 64,971.92/x
3. Step 3: Cross multiply
   118,686.87x = 163,787.86 × 64,971.92
4. Step 4: Simplify right side
   118,686.87x = 10,641,611,736.89
5. Step 5: Solve for x
   x = 10,641,611,736.89/118,686.87
6. Step 6: Final answer
   x = 89,661.24