Finding the Fourth Proportional to 78,488.38, 108,354.03 and 53,128.77

Step by Step Solution

1. Step 1: Write the proportion equation
   78,488.38 : 108,354.03 = 53,128.77 : x
2. Step 2: Convert to fraction form
   78,488.38/108,354.03 = 53,128.77/x
3. Step 3: Cross multiply
   78,488.38x = 108,354.03 × 53,128.77
4. Step 4: Simplify right side
   78,488.38x = 5,756,716,338.44
5. Step 5: Solve for x
   x = 5,756,716,338.44/78,488.38
6. Step 6: Final answer
   x = 73,344.82