Finding the Third Proportional to 58,390.50 and 90,319.50

Step by Step Solution

1. Step 1: Write the proportion equation
   58,390.50 : 90,319.50 = 90,319.50 : x
2. Step 2: Convert to fraction form
   58,390.50/90,319.50 = 90,319.50/x
3. Step 3: Cross multiply
   58,390.50x = 90,319.50 × 90,319.50
4. Step 4: Simplify right side
   58,390.50x = 8,157,612,080.25
5. Step 5: Solve for x
   x = 8,157,612,080.25/58,390.50
6. Step 6: Final answer
   x = 139,707.86