Finding the Fourth Proportional to 78,406.17, 117,572.32 and 28,451.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78,406.17 : 117,572.32 = 28,451.31 : x
2. Step 2: Convert to fraction form
   78,406.17/117,572.32 = 28,451.31/x
3. Step 3: Cross multiply
   78,406.17x = 117,572.32 × 28,451.31
4. Step 4: Simplify right side
   78,406.17x = 3,345,086,523.74
5. Step 5: Solve for x
   x = 3,345,086,523.74/78,406.17
6. Step 6: Final answer
   x = 42,663.56