Finding the Fourth Proportional to 71,980, 99,332.40 and 42,172

Step by Step Solution

1. Step 1: Write the proportion equation
   71,980 : 99,332.40 = 42,172 : x
2. Step 2: Convert to fraction form
   71,980/99,332.40 = 42,172/x
3. Step 3: Cross multiply
   71,980x = 99,332.40 × 42,172
4. Step 4: Simplify right side
   71,980x = 4,189,045,972.80
5. Step 5: Solve for x
   x = 4,189,045,972.80/71,980
6. Step 6: Final answer
   x = 58,197.36