Finding the Fourth Proportional to 128,876.10, 193,314.15 and 89,510.10

Step by Step Solution

1. Step 1: Write the proportion equation
   128,876.10 : 193,314.15 = 89,510.10 : x
2. Step 2: Convert to fraction form
   128,876.10/193,314.15 = 89,510.10/x
3. Step 3: Cross multiply
   128,876.10x = 193,314.15 × 89,510.10
4. Step 4: Simplify right side
   128,876.10x = 17,303,568,897.92
5. Step 5: Solve for x
   x = 17,303,568,897.92/128,876.10
6. Step 6: Final answer
   x = 134,265.15