Finding the Fourth Proportional to 91,925.76, 138,005.40 and 78,162.24

Step by Step Solution

1. Step 1: Write the proportion equation
   91,925.76 : 138,005.40 = 78,162.24 : x
2. Step 2: Convert to fraction form
   91,925.76/138,005.40 = 78,162.24/x
3. Step 3: Cross multiply
   91,925.76x = 138,005.40 × 78,162.24
4. Step 4: Simplify right side
   91,925.76x = 10,786,811,196.10
5. Step 5: Solve for x
   x = 10,786,811,196.10/91,925.76
6. Step 6: Final answer
   x = 117,342.64