Finding the Fourth Proportional to 93,111.20, 128,557.74 and 87,162.56

Step by Step Solution

1. Step 1: Write the proportion equation
   93,111.20 : 128,557.74 = 87,162.56 : x
2. Step 2: Convert to fraction form
   93,111.20/128,557.74 = 87,162.56/x
3. Step 3: Cross multiply
   93,111.20x = 128,557.74 × 87,162.56
4. Step 4: Simplify right side
   93,111.20x = 11,205,421,726.21
5. Step 5: Solve for x
   x = 11,205,421,726.21/93,111.20
6. Step 6: Final answer
   x = 120,344.51