Finding the Third Proportional to 61,210.50 and 91,531.50

Step by Step Solution

1. Step 1: Write the proportion equation
   61,210.50 : 91,531.50 = 91,531.50 : x
2. Step 2: Convert to fraction form
   61,210.50/91,531.50 = 91,531.50/x
3. Step 3: Cross multiply
   61,210.50x = 91,531.50 × 91,531.50
4. Step 4: Simplify right side
   61,210.50x = 8,378,015,492.25
5. Step 5: Solve for x
   x = 8,378,015,492.25/61,210.50
6. Step 6: Final answer
   x = 136,872.20