Finding the Third Proportional to 56,931.50 and 78,938.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,931.50 : 78,938.50 = 78,938.50 : x
2. Step 2: Convert to fraction form
   56,931.50/78,938.50 = 78,938.50/x
3. Step 3: Cross multiply
   56,931.50x = 78,938.50 × 78,938.50
4. Step 4: Simplify right side
   56,931.50x = 6,231,286,782.25
5. Step 5: Solve for x
   x = 6,231,286,782.25/56,931.50
6. Step 6: Final answer
   x = 109,452.36