Finding the Fourth Proportional to 72,576.96, 108,848.88 and 19,991.04

Step by Step Solution

1. Step 1: Write the proportion equation
   72,576.96 : 108,848.88 = 19,991.04 : x
2. Step 2: Convert to fraction form
   72,576.96/108,848.88 = 19,991.04/x
3. Step 3: Cross multiply
   72,576.96x = 108,848.88 × 19,991.04
4. Step 4: Simplify right side
   72,576.96x = 2,176,002,314.04
5. Step 5: Solve for x
   x = 2,176,002,314.04/72,576.96
6. Step 6: Final answer
   x = 29,982.00