Finding the Fourth Proportional to 42,686.79, 63,978.34 and 30,210.46

Step by Step Solution

1. Step 1: Write the proportion equation
   42,686.79 : 63,978.34 = 30,210.46 : x
2. Step 2: Convert to fraction form
   42,686.79/63,978.34 = 30,210.46/x
3. Step 3: Cross multiply
   42,686.79x = 63,978.34 × 30,210.46
4. Step 4: Simplify right side
   42,686.79x = 1,932,815,081.44
5. Step 5: Solve for x
   x = 1,932,815,081.44/42,686.79
6. Step 6: Final answer
   x = 45,279.00