Finding the Third Proportional to 272,521.50 and 390,097.50

Step by Step Solution

1. Step 1: Write the proportion equation
   272,521.50 : 390,097.50 = 390,097.50 : x
2. Step 2: Convert to fraction form
   272,521.50/390,097.50 = 390,097.50/x
3. Step 3: Cross multiply
   272,521.50x = 390,097.50 × 390,097.50
4. Step 4: Simplify right side
   272,521.50x = 152,176,059,506.25
5. Step 5: Solve for x
   x = 152,176,059,506.25/272,521.50
6. Step 6: Final answer
   x = 558,400.20