Finding the Fourth Proportional to 71,263.31, 106,911.59 and 20,663.39

Step by Step Solution

1. Step 1: Write the proportion equation
   71,263.31 : 106,911.59 = 20,663.39 : x
2. Step 2: Convert to fraction form
   71,263.31/106,911.59 = 20,663.39/x
3. Step 3: Cross multiply
   71,263.31x = 106,911.59 × 20,663.39
4. Step 4: Simplify right side
   71,263.31x = 2,209,155,776.37
5. Step 5: Solve for x
   x = 2,209,155,776.37/71,263.31
6. Step 6: Final answer
   x = 30,999.91