Finding the Fourth Proportional to 128,111.40, 176,810.04 and 74,385.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,111.40 : 176,810.04 = 74,385.72 : x
2. Step 2: Convert to fraction form
   128,111.40/176,810.04 = 74,385.72/x
3. Step 3: Cross multiply
   128,111.40x = 176,810.04 × 74,385.72
4. Step 4: Simplify right side
   128,111.40x = 13,152,142,128.63
5. Step 5: Solve for x
   x = 13,152,142,128.63/128,111.40
6. Step 6: Final answer
   x = 102,661.76