Finding the Fourth Proportional to 81,980.10, 113,136.76 and 50,139

Step by Step Solution

1. Step 1: Write the proportion equation
   81,980.10 : 113,136.76 = 50,139 : x
2. Step 2: Convert to fraction form
   81,980.10/113,136.76 = 50,139/x
3. Step 3: Cross multiply
   81,980.10x = 113,136.76 × 50,139
4. Step 4: Simplify right side
   81,980.10x = 5,672,564,009.64
5. Step 5: Solve for x
   x = 5,672,564,009.64/81,980.10
6. Step 6: Final answer
   x = 69,194.40