Finding the Fourth Proportional to 78,090.08, 107,764.56 and 42,280.48

Step by Step Solution

1. Step 1: Write the proportion equation
   78,090.08 : 107,764.56 = 42,280.48 : x
2. Step 2: Convert to fraction form
   78,090.08/107,764.56 = 42,280.48/x
3. Step 3: Cross multiply
   78,090.08x = 107,764.56 × 42,280.48
4. Step 4: Simplify right side
   78,090.08x = 4,556,337,323.79
5. Step 5: Solve for x
   x = 4,556,337,323.79/78,090.08
6. Step 6: Final answer
   x = 58,347.20