Finding the Third Proportional to 56,421 and 87,079.50

Step by Step Solution

1. Step 1: Write the proportion equation
   56,421 : 87,079.50 = 87,079.50 : x
2. Step 2: Convert to fraction form
   56,421/87,079.50 = 87,079.50/x
3. Step 3: Cross multiply
   56,421x = 87,079.50 × 87,079.50
4. Step 4: Simplify right side
   56,421x = 7,582,839,320.25
5. Step 5: Solve for x
   x = 7,582,839,320.25/56,421
6. Step 6: Final answer
   x = 134,397.46