Finding the Fourth Proportional to 78,120.84, 107,806.50 and 42,310.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78,120.84 : 107,806.50 = 42,310.76 : x
2. Step 2: Convert to fraction form
   78,120.84/107,806.50 = 42,310.76/x
3. Step 3: Cross multiply
   78,120.84x = 107,806.50 × 42,310.76
4. Step 4: Simplify right side
   78,120.84x = 4,561,374,947.94
5. Step 5: Solve for x
   x = 4,561,374,947.94/78,120.84
6. Step 6: Final answer
   x = 58,388.71