Finding the Fourth Proportional to 42,980.73, 64,470.78 and 30,278.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,980.73 : 64,470.78 = 30,278.20 : x
2. Step 2: Convert to fraction form
   42,980.73/64,470.78 = 30,278.20/x
3. Step 3: Cross multiply
   42,980.73x = 64,470.78 × 30,278.20
4. Step 4: Simplify right side
   42,980.73x = 1,952,059,171.00
5. Step 5: Solve for x
   x = 1,952,059,171.00/42,980.73
6. Step 6: Final answer
   x = 45,417.08