Finding the Fourth Proportional to 91,968.54, 138,127.78 and 57,151.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,968.54 : 138,127.78 = 57,151.50 : x
2. Step 2: Convert to fraction form
   91,968.54/138,127.78 = 57,151.50/x
3. Step 3: Cross multiply
   91,968.54x = 138,127.78 × 57,151.50
4. Step 4: Simplify right side
   91,968.54x = 7,894,209,818.67
5. Step 5: Solve for x
   x = 7,894,209,818.67/91,968.54
6. Step 6: Final answer
   x = 85,835.98