Finding the Fourth Proportional to 136,428.69, 204,642.72 and 52,197.15

Step by Step Solution

1. Step 1: Write the proportion equation
   136,428.69 : 204,642.72 = 52,197.15 : x
2. Step 2: Convert to fraction form
   136,428.69/204,642.72 = 52,197.15/x
3. Step 3: Cross multiply
   136,428.69x = 204,642.72 × 52,197.15
4. Step 4: Simplify right side
   136,428.69x = 10,681,766,752.25
5. Step 5: Solve for x
   x = 10,681,766,752.25/136,428.69
6. Step 6: Final answer
   x = 78,295.60