Finding the Fourth Proportional to 99,886.69, 137,960.65 and 79,536.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,886.69 : 137,960.65 = 79,536.88 : x
2. Step 2: Convert to fraction form
   99,886.69/137,960.65 = 79,536.88/x
3. Step 3: Cross multiply
   99,886.69x = 137,960.65 × 79,536.88
4. Step 4: Simplify right side
   99,886.69x = 10,972,959,663.77
5. Step 5: Solve for x
   x = 10,972,959,663.77/99,886.69
6. Step 6: Final answer
   x = 109,854.07