Finding the Third Proportional to 28,570.50 and 42,828.75

Step by Step Solution

1. Step 1: Write the proportion equation
   28,570.50 : 42,828.75 = 42,828.75 : x
2. Step 2: Convert to fraction form
   28,570.50/42,828.75 = 42,828.75/x
3. Step 3: Cross multiply
   28,570.50x = 42,828.75 × 42,828.75
4. Step 4: Simplify right side
   28,570.50x = 1,834,301,826.56
5. Step 5: Solve for x
   x = 1,834,301,826.56/28,570.50
6. Step 6: Final answer
   x = 64,202.65