Finding the Fourth Proportional to 99,931.96, 137,892.83 and 64,170.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99,931.96 : 137,892.83 = 64,170.42 : x
2. Step 2: Convert to fraction form
   99,931.96/137,892.83 = 64,170.42/x
3. Step 3: Cross multiply
   99,931.96x = 137,892.83 × 64,170.42
4. Step 4: Simplify right side
   99,931.96x = 8,848,640,816.09
5. Step 5: Solve for x
   x = 8,848,640,816.09/99,931.96
6. Step 6: Final answer
   x = 88,546.66