Finding the Third Proportional to 111,420.56 and 172,600.88

Step by Step Solution

1. Step 1: Write the proportion equation
   111,420.56 : 172,600.88 = 172,600.88 : x
2. Step 2: Convert to fraction form
   111,420.56/172,600.88 = 172,600.88/x
3. Step 3: Cross multiply
   111,420.56x = 172,600.88 × 172,600.88
4. Step 4: Simplify right side
   111,420.56x = 29,791,062,050.77
5. Step 5: Solve for x
   x = 29,791,062,050.77/111,420.56
6. Step 6: Final answer
   x = 267,374.90