Finding the Fourth Proportional to 99,888.69, 137,963.41 and 79,538.88

Step by Step Solution

1. Step 1: Write the proportion equation
   99,888.69 : 137,963.41 = 79,538.88 : x
2. Step 2: Convert to fraction form
   99,888.69/137,963.41 = 79,538.88/x
3. Step 3: Cross multiply
   99,888.69x = 137,963.41 × 79,538.88
4. Step 4: Simplify right side
   99,888.69x = 10,973,455,112.38
5. Step 5: Solve for x
   x = 10,973,455,112.38/99,888.69
6. Step 6: Final answer
   x = 109,856.83