Finding the Fourth Proportional to 99,928.36, 137,835.84 and 64,061.56

Step by Step Solution

1. Step 1: Write the proportion equation
   99,928.36 : 137,835.84 = 64,061.56 : x
2. Step 2: Convert to fraction form
   99,928.36/137,835.84 = 64,061.56/x
3. Step 3: Cross multiply
   99,928.36x = 137,835.84 × 64,061.56
4. Step 4: Simplify right side
   99,928.36x = 8,829,978,934.31
5. Step 5: Solve for x
   x = 8,829,978,934.31/99,928.36
6. Step 6: Final answer
   x = 88,363.09