Finding the Fourth Proportional to 70,156.60, 105,251.33 and 47,980.42

Step by Step Solution

1. Step 1: Write the proportion equation
   70,156.60 : 105,251.33 = 47,980.42 : x
2. Step 2: Convert to fraction form
   70,156.60/105,251.33 = 47,980.42/x
3. Step 3: Cross multiply
   70,156.60x = 105,251.33 × 47,980.42
4. Step 4: Simplify right side
   70,156.60x = 5,050,002,875.78
5. Step 5: Solve for x
   x = 5,050,002,875.78/70,156.60
6. Step 6: Final answer
   x = 71,981.87