Finding the Fourth Proportional to 99,971.78, 150,031.50 and 47,381.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99,971.78 : 150,031.50 = 47,381.42 : x
2. Step 2: Convert to fraction form
   99,971.78/150,031.50 = 47,381.42/x
3. Step 3: Cross multiply
   99,971.78x = 150,031.50 × 47,381.42
4. Step 4: Simplify right side
   99,971.78x = 7,108,705,514.73
5. Step 5: Solve for x
   x = 7,108,705,514.73/99,971.78
6. Step 6: Final answer
   x = 71,107.12