Finding the Fourth Proportional to 127,978.86, 176,596.83 and 90,187.50

Step by Step Solution

1. Step 1: Write the proportion equation
   127,978.86 : 176,596.83 = 90,187.50 : x
2. Step 2: Convert to fraction form
   127,978.86/176,596.83 = 90,187.50/x
3. Step 3: Cross multiply
   127,978.86x = 176,596.83 × 90,187.50
4. Step 4: Simplify right side
   127,978.86x = 15,926,826,605.63
5. Step 5: Solve for x
   x = 15,926,826,605.63/127,978.86
6. Step 6: Final answer
   x = 124,448.89