Finding the Fourth Proportional to 28,238.79, 42,371.82 and 19,971.93

Step by Step Solution

1. Step 1: Write the proportion equation
   28,238.79 : 42,371.82 = 19,971.93 : x
2. Step 2: Convert to fraction form
   28,238.79/42,371.82 = 19,971.93/x
3. Step 3: Cross multiply
   28,238.79x = 42,371.82 × 19,971.93
4. Step 4: Simplify right side
   28,238.79x = 846,247,023.01
5. Step 5: Solve for x
   x = 846,247,023.01/28,238.79
6. Step 6: Final answer
   x = 29,967.54