Finding the Fourth Proportional to 78,090.12, 107,764.56 and 42,280.56

Step by Step Solution

1. Step 1: Write the proportion equation
   78,090.12 : 107,764.56 = 42,280.56 : x
2. Step 2: Convert to fraction form
   78,090.12/107,764.56 = 42,280.56/x
3. Step 3: Cross multiply
   78,090.12x = 107,764.56 × 42,280.56
4. Step 4: Simplify right side
   78,090.12x = 4,556,345,944.95
5. Step 5: Solve for x
   x = 4,556,345,944.95/78,090.12
6. Step 6: Final answer
   x = 58,347.28