Finding the Fourth Proportional to 78,030.40, 107,681.18 and 42,219.62

Step by Step Solution

1. Step 1: Write the proportion equation
   78,030.40 : 107,681.18 = 42,219.62 : x
2. Step 2: Convert to fraction form
   78,030.40/107,681.18 = 42,219.62/x
3. Step 3: Cross multiply
   78,030.40x = 107,681.18 × 42,219.62
4. Step 4: Simplify right side
   78,030.40x = 4,546,258,500.75
5. Step 5: Solve for x
   x = 4,546,258,500.75/78,030.40
6. Step 6: Final answer
   x = 58,262.66