Finding the Fourth Proportional to 78,109.86, 107,791.45 and 42,299.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78,109.86 : 107,791.45 = 42,299.76 : x
2. Step 2: Convert to fraction form
   78,109.86/107,791.45 = 42,299.76/x
3. Step 3: Cross multiply
   78,109.86x = 107,791.45 × 42,299.76
4. Step 4: Simplify right side
   78,109.86x = 4,559,552,763.52
5. Step 5: Solve for x
   x = 4,559,552,763.52/78,109.86
6. Step 6: Final answer
   x = 58,373.58