Finding the Fourth Proportional to 90,618.81, 125,003.55 and 84,204.15

Step by Step Solution

1. Step 1: Write the proportion equation
   90,618.81 : 125,003.55 = 84,204.15 : x
2. Step 2: Convert to fraction form
   90,618.81/125,003.55 = 84,204.15/x
3. Step 3: Cross multiply
   90,618.81x = 125,003.55 × 84,204.15
4. Step 4: Simplify right side
   90,618.81x = 10,525,817,674.73
5. Step 5: Solve for x
   x = 10,525,817,674.73/90,618.81
6. Step 6: Final answer
   x = 116,154.89