Finding the Fourth Proportional to 128,510.06, 192,554.39 and 91,002.78

Step by Step Solution

1. Step 1: Write the proportion equation
   128,510.06 : 192,554.39 = 91,002.78 : x
2. Step 2: Convert to fraction form
   128,510.06/192,554.39 = 91,002.78/x
3. Step 3: Cross multiply
   128,510.06x = 192,554.39 × 91,002.78
4. Step 4: Simplify right side
   128,510.06x = 17,522,985,018.71
5. Step 5: Solve for x
   x = 17,522,985,018.71/128,510.06
6. Step 6: Final answer
   x = 136,354.97