Finding the Fourth Proportional to 99,731.85, 137,680.76 and 77,019.86

Step by Step Solution

1. Step 1: Write the proportion equation
   99,731.85 : 137,680.76 = 77,019.86 : x
2. Step 2: Convert to fraction form
   99,731.85/137,680.76 = 77,019.86/x
3. Step 3: Cross multiply
   99,731.85x = 137,680.76 × 77,019.86
4. Step 4: Simplify right side
   99,731.85x = 10,604,151,786.39
5. Step 5: Solve for x
   x = 10,604,151,786.39/99,731.85
6. Step 6: Final answer
   x = 106,326.63