Finding the Fourth Proportional to 78,089.60, 107,763.16 and 42,279.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,089.60 : 107,763.16 = 42,279.50 : x
2. Step 2: Convert to fraction form
   78,089.60/107,763.16 = 42,279.50/x
3. Step 3: Cross multiply
   78,089.60x = 107,763.16 × 42,279.50
4. Step 4: Simplify right side
   78,089.60x = 4,556,172,766.20
5. Step 5: Solve for x
   x = 4,556,172,766.20/78,089.60
6. Step 6: Final answer
   x = 58,345.45