Finding the Third Proportional to 57,710.50 and 90,210.75

Step by Step Solution

1. Step 1: Write the proportion equation
   57,710.50 : 90,210.75 = 90,210.75 : x
2. Step 2: Convert to fraction form
   57,710.50/90,210.75 = 90,210.75/x
3. Step 3: Cross multiply
   57,710.50x = 90,210.75 × 90,210.75
4. Step 4: Simplify right side
   57,710.50x = 8,137,979,415.56
5. Step 5: Solve for x
   x = 8,137,979,415.56/57,710.50
6. Step 6: Final answer
   x = 141,013.84