Finding the Third Proportional to 553,678.88 and 854,128.69

Step by Step Solution

1. Step 1: Write the proportion equation
   553,678.88 : 854,128.69 = 854,128.69 : x
2. Step 2: Convert to fraction form
   553,678.88/854,128.69 = 854,128.69/x
3. Step 3: Cross multiply
   553,678.88x = 854,128.69 × 854,128.69
4. Step 4: Simplify right side
   553,678.88x = 729,535,814,810.47
5. Step 5: Solve for x
   x = 729,535,814,810.47/553,678.88
6. Step 6: Final answer
   x = 1,317,615.40