Finding the Fourth Proportional to 67,661, 101,501.20 and 20,917.52

Step by Step Solution

1. Step 1: Write the proportion equation
   67,661 : 101,501.20 = 20,917.52 : x
2. Step 2: Convert to fraction form
   67,661/101,501.20 = 20,917.52/x
3. Step 3: Cross multiply
   67,661x = 101,501.20 × 20,917.52
4. Step 4: Simplify right side
   67,661x = 2,123,153,381.02
5. Step 5: Solve for x
   x = 2,123,153,381.02/67,661
6. Step 6: Final answer
   x = 31,379.28