Finding the Third Proportional to 54,031.78 and 86,814.28

Step by Step Solution

1. Step 1: Write the proportion equation
   54,031.78 : 86,814.28 = 86,814.28 : x
2. Step 2: Convert to fraction form
   54,031.78/86,814.28 = 86,814.28/x
3. Step 3: Cross multiply
   54,031.78x = 86,814.28 × 86,814.28
4. Step 4: Simplify right side
   54,031.78x = 7,536,719,428.95
5. Step 5: Solve for x
   x = 7,536,719,428.95/54,031.78
6. Step 6: Final answer
   x = 139,486.78