Finding the Third Proportional to 58,121 and 89,810.50

Step by Step Solution

1. Step 1: Write the proportion equation
   58,121 : 89,810.50 = 89,810.50 : x
2. Step 2: Convert to fraction form
   58,121/89,810.50 = 89,810.50/x
3. Step 3: Cross multiply
   58,121x = 89,810.50 × 89,810.50
4. Step 4: Simplify right side
   58,121x = 8,065,925,910.25
5. Step 5: Solve for x
   x = 8,065,925,910.25/58,121
6. Step 6: Final answer
   x = 138,778.17