Finding the Fourth Proportional to 78,100.54, 107,778.58 and 42,290.65

Step by Step Solution

1. Step 1: Write the proportion equation
   78,100.54 : 107,778.58 = 42,290.65 : x
2. Step 2: Convert to fraction form
   78,100.54/107,778.58 = 42,290.65/x
3. Step 3: Cross multiply
   78,100.54x = 107,778.58 × 42,290.65
4. Step 4: Simplify right side
   78,100.54x = 4,558,026,204.28
5. Step 5: Solve for x
   x = 4,558,026,204.28/78,100.54
6. Step 6: Final answer
   x = 58,361.01