Finding the Fourth Proportional to 128,300.10, 192,644.55 and 98,751.30

Step by Step Solution

1. Step 1: Write the proportion equation
   128,300.10 : 192,644.55 = 98,751.30 : x
2. Step 2: Convert to fraction form
   128,300.10/192,644.55 = 98,751.30/x
3. Step 3: Cross multiply
   128,300.10x = 192,644.55 × 98,751.30
4. Step 4: Simplify right side
   128,300.10x = 19,023,899,750.42
5. Step 5: Solve for x
   x = 19,023,899,750.42/128,300.10
6. Step 6: Final answer
   x = 148,276.58