Finding the Fourth Proportional to 128,870.52, 177,437.16 and 117,060.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,870.52 : 177,437.16 = 117,060.72 : x
2. Step 2: Convert to fraction form
   128,870.52/177,437.16 = 117,060.72/x
3. Step 3: Cross multiply
   128,870.52x = 177,437.16 × 117,060.72
4. Step 4: Simplify right side
   128,870.52x = 20,770,921,704.36
5. Step 5: Solve for x
   x = 20,770,921,704.36/128,870.52
6. Step 6: Final answer
   x = 161,176.67