Finding the Fourth Proportional to 128,061.87, 191,937.24 and 90,632.88

Step by Step Solution

1. Step 1: Write the proportion equation
   128,061.87 : 191,937.24 = 90,632.88 : x
2. Step 2: Convert to fraction form
   128,061.87/191,937.24 = 90,632.88/x
3. Step 3: Cross multiply
   128,061.87x = 191,937.24 × 90,632.88
4. Step 4: Simplify right side
   128,061.87x = 17,395,824,840.45
5. Step 5: Solve for x
   x = 17,395,824,840.45/128,061.87
6. Step 6: Final answer
   x = 135,839.22