Finding the Fourth Proportional to 47,211.69, 70,782.15 and 28,487.30

Step by Step Solution

1. Step 1: Write the proportion equation
   47,211.69 : 70,782.15 = 28,487.30 : x
2. Step 2: Convert to fraction form
   47,211.69/70,782.15 = 28,487.30/x
3. Step 3: Cross multiply
   47,211.69x = 70,782.15 × 28,487.30
4. Step 4: Simplify right side
   47,211.69x = 2,016,392,094.61
5. Step 5: Solve for x
   x = 2,016,392,094.61/47,211.69
6. Step 6: Final answer
   x = 42,709.60