Finding the Fourth Proportional to 138,285.16, 190,864.56 and 90,510.69

Step by Step Solution

1. Step 1: Write the proportion equation
   138,285.16 : 190,864.56 = 90,510.69 : x
2. Step 2: Convert to fraction form
   138,285.16/190,864.56 = 90,510.69/x
3. Step 3: Cross multiply
   138,285.16x = 190,864.56 × 90,510.69
4. Step 4: Simplify right side
   138,285.16x = 17,275,283,022.15
5. Step 5: Solve for x
   x = 17,275,283,022.15/138,285.16
6. Step 6: Final answer
   x = 124,925.07