Finding the Fourth Proportional to 90,585.91, 135,268.86 and 73,978.89

Step by Step Solution

1. Step 1: Write the proportion equation
   90,585.91 : 135,268.86 = 73,978.89 : x
2. Step 2: Convert to fraction form
   90,585.91/135,268.86 = 73,978.89/x
3. Step 3: Cross multiply
   90,585.91x = 135,268.86 × 73,978.89
4. Step 4: Simplify right side
   90,585.91x = 10,007,039,253.07
5. Step 5: Solve for x
   x = 10,007,039,253.07/90,585.91
6. Step 6: Final answer
   x = 110,470.15