Finding the Fourth Proportional to 78,109.78, 107,791.58 and 42,299.84

Step by Step Solution

1. Step 1: Write the proportion equation
   78,109.78 : 107,791.58 = 42,299.84 : x
2. Step 2: Convert to fraction form
   78,109.78/107,791.58 = 42,299.84/x
3. Step 3: Cross multiply
   78,109.78x = 107,791.58 × 42,299.84
4. Step 4: Simplify right side
   78,109.78x = 4,559,566,587.35
5. Step 5: Solve for x
   x = 4,559,566,587.35/78,109.78
6. Step 6: Final answer
   x = 58,373.82