Finding the Fourth Proportional to 72,128.25, 108,179.01 and 19,530.90

Step by Step Solution

1. Step 1: Write the proportion equation
   72,128.25 : 108,179.01 = 19,530.90 : x
2. Step 2: Convert to fraction form
   72,128.25/108,179.01 = 19,530.90/x
3. Step 3: Cross multiply
   72,128.25x = 108,179.01 × 19,530.90
4. Step 4: Simplify right side
   72,128.25x = 2,112,833,426.41
5. Step 5: Solve for x
   x = 2,112,833,426.41/72,128.25
6. Step 6: Final answer
   x = 29,292.73