Finding the Fourth Proportional to 87,019.72, 120,090.18 and 48,780.88

Step by Step Solution

1. Step 1: Write the proportion equation
   87,019.72 : 120,090.18 = 48,780.88 : x
2. Step 2: Convert to fraction form
   87,019.72/120,090.18 = 48,780.88/x
3. Step 3: Cross multiply
   87,019.72x = 120,090.18 × 48,780.88
4. Step 4: Simplify right side
   87,019.72x = 5,858,104,659.76
5. Step 5: Solve for x
   x = 5,858,104,659.76/87,019.72
6. Step 6: Final answer
   x = 67,319.28