Finding the Third Proportional to 57,296.50 and 87,428.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57,296.50 : 87,428.50 = 87,428.50 : x
2. Step 2: Convert to fraction form
   57,296.50/87,428.50 = 87,428.50/x
3. Step 3: Cross multiply
   57,296.50x = 87,428.50 × 87,428.50
4. Step 4: Simplify right side
   57,296.50x = 7,643,742,612.25
5. Step 5: Solve for x
   x = 7,643,742,612.25/57,296.50
6. Step 6: Final answer
   x = 133,406.80