Finding the Fourth Proportional to 99,128.69, 148,840.65 and 40,079.69

Step by Step Solution

1. Step 1: Write the proportion equation
   99,128.69 : 148,840.65 = 40,079.69 : x
2. Step 2: Convert to fraction form
   99,128.69/148,840.65 = 40,079.69/x
3. Step 3: Cross multiply
   99,128.69x = 148,840.65 × 40,079.69
4. Step 4: Simplify right side
   99,128.69x = 5,965,487,111.40
5. Step 5: Solve for x
   x = 5,965,487,111.40/99,128.69
6. Step 6: Final answer
   x = 60,179.22