Finding the Third Proportional to 291,272 and 393,527.50

Step by Step Solution

1. Step 1: Write the proportion equation
   291,272 : 393,527.50 = 393,527.50 : x
2. Step 2: Convert to fraction form
   291,272/393,527.50 = 393,527.50/x
3. Step 3: Cross multiply
   291,272x = 393,527.50 × 393,527.50
4. Step 4: Simplify right side
   291,272x = 154,863,893,256.25
5. Step 5: Solve for x
   x = 154,863,893,256.25/291,272
6. Step 6: Final answer
   x = 531,681.36