Finding the Fourth Proportional to 147,978.63, 221,970 and 48,139.35

Step by Step Solution

1. Step 1: Write the proportion equation
   147,978.63 : 221,970 = 48,139.35 : x
2. Step 2: Convert to fraction form
   147,978.63/221,970 = 48,139.35/x
3. Step 3: Cross multiply
   147,978.63x = 221,970 × 48,139.35
4. Step 4: Simplify right side
   147,978.63x = 10,685,491,519.50
5. Step 5: Solve for x
   x = 10,685,491,519.50/147,978.63
6. Step 6: Final answer
   x = 72,209.69