Finding the Fourth Proportional to 78,978.42, 118,488.40 and 28,382.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,978.42 : 118,488.40 = 28,382.56 : x
2. Step 2: Convert to fraction form
   78,978.42/118,488.40 = 28,382.56/x
3. Step 3: Cross multiply
   78,978.42x = 118,488.40 × 28,382.56
4. Step 4: Simplify right side
   78,978.42x = 3,363,003,529.86
5. Step 5: Solve for x
   x = 3,363,003,529.86/78,978.42
6. Step 6: Final answer
   x = 42,581.30