Finding the Third Proportional to 253,681.50 and 390,060

Step by Step Solution

1. Step 1: Write the proportion equation
   253,681.50 : 390,060 = 390,060 : x
2. Step 2: Convert to fraction form
   253,681.50/390,060 = 390,060/x
3. Step 3: Cross multiply
   253,681.50x = 390,060 × 390,060
4. Step 4: Simplify right side
   253,681.50x = 152,146,803,600
5. Step 5: Solve for x
   x = 152,146,803,600/253,681.50
6. Step 6: Final answer
   x = 599,755.22