Finding the Fourth Proportional to 78,112.40, 107,793.78 and 42,302.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78,112.40 : 107,793.78 = 42,302.12 : x
2. Step 2: Convert to fraction form
   78,112.40/107,793.78 = 42,302.12/x
3. Step 3: Cross multiply
   78,112.40x = 107,793.78 × 42,302.12
4. Step 4: Simplify right side
   78,112.40x = 4,559,905,416.81
5. Step 5: Solve for x
   x = 4,559,905,416.81/78,112.40
6. Step 6: Final answer
   x = 58,376.20