Finding the Fourth Proportional to 78,488.28, 108,315.18 and 42,678.54

Step by Step Solution

1. Step 1: Write the proportion equation
   78,488.28 : 108,315.18 = 42,678.54 : x
2. Step 2: Convert to fraction form
   78,488.28/108,315.18 = 42,678.54/x
3. Step 3: Cross multiply
   78,488.28x = 108,315.18 × 42,678.54
4. Step 4: Simplify right side
   78,488.28x = 4,622,733,742.24
5. Step 5: Solve for x
   x = 4,622,733,742.24/78,488.28
6. Step 6: Final answer
   x = 58,897.12