Finding the Third Proportional to 148,908 and 318,592.50

Step by Step Solution

1. Step 1: Write the proportion equation
   148,908 : 318,592.50 = 318,592.50 : x
2. Step 2: Convert to fraction form
   148,908/318,592.50 = 318,592.50/x
3. Step 3: Cross multiply
   148,908x = 318,592.50 × 318,592.50
4. Step 4: Simplify right side
   148,908x = 101,501,181,056.25
5. Step 5: Solve for x
   x = 101,501,181,056.25/148,908
6. Step 6: Final answer
   x = 681,636.86