Finding the Third Proportional to 386,499.75 and 556,681.50

Step by Step Solution

1. Step 1: Write the proportion equation
   386,499.75 : 556,681.50 = 556,681.50 : x
2. Step 2: Convert to fraction form
   386,499.75/556,681.50 = 556,681.50/x
3. Step 3: Cross multiply
   386,499.75x = 556,681.50 × 556,681.50
4. Step 4: Simplify right side
   386,499.75x = 309,894,292,442.25
5. Step 5: Solve for x
   x = 309,894,292,442.25/386,499.75
6. Step 6: Final answer
   x = 801,796.88