Finding the Fourth Proportional to 78,199.84, 107,915.40 and 42,389.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,199.84 : 107,915.40 = 42,389.72 : x
2. Step 2: Convert to fraction form
   78,199.84/107,915.40 = 42,389.72/x
3. Step 3: Cross multiply
   78,199.84x = 107,915.40 × 42,389.72
4. Step 4: Simplify right side
   78,199.84x = 4,574,503,589.69
5. Step 5: Solve for x
   x = 4,574,503,589.69/78,199.84
6. Step 6: Final answer
   x = 58,497.61