Finding the Fourth Proportional to 135,078.47, 202,436.59 and 105,128.88

Step by Step Solution

1. Step 1: Write the proportion equation
   135,078.47 : 202,436.59 = 105,128.88 : x
2. Step 2: Convert to fraction form
   135,078.47/202,436.59 = 105,128.88/x
3. Step 3: Cross multiply
   135,078.47x = 202,436.59 × 105,128.88
4. Step 4: Simplify right side
   135,078.47x = 21,281,931,977.72
5. Step 5: Solve for x
   x = 21,281,931,977.72/135,078.47
6. Step 6: Final answer
   x = 157,552.36