Finding the Fourth Proportional to 28,372.83, 42,440.72 and 19,938.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,372.83 : 42,440.72 = 19,938.72 : x
2. Step 2: Convert to fraction form
   28,372.83/42,440.72 = 19,938.72/x
3. Step 3: Cross multiply
   28,372.83x = 42,440.72 × 19,938.72
4. Step 4: Simplify right side
   28,372.83x = 846,213,532.98
5. Step 5: Solve for x
   x = 846,213,532.98/28,372.83
6. Step 6: Final answer
   x = 29,824.78