Finding the Third Proportional to 42,129 and 56,713.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,129 : 56,713.50 = 56,713.50 : x
2. Step 2: Convert to fraction form
   42,129/56,713.50 = 56,713.50/x
3. Step 3: Cross multiply
   42,129x = 56,713.50 × 56,713.50
4. Step 4: Simplify right side
   42,129x = 3,216,421,082.25
5. Step 5: Solve for x
   x = 3,216,421,082.25/42,129
6. Step 6: Final answer
   x = 76,346.96