Finding the Fourth Proportional to 99,742.79, 137,695.82 and 77,030.80

Step by Step Solution

1. Step 1: Write the proportion equation
   99,742.79 : 137,695.82 = 77,030.80 : x
2. Step 2: Convert to fraction form
   99,742.79/137,695.82 = 77,030.80/x
3. Step 3: Cross multiply
   99,742.79x = 137,695.82 × 77,030.80
4. Step 4: Simplify right side
   99,742.79x = 10,606,818,441.86
5. Step 5: Solve for x
   x = 10,606,818,441.86/99,742.79
6. Step 6: Final answer
   x = 106,341.70