Finding the Fourth Proportional to 19,761.91, 29,388.71 and 19,139.02

Step by Step Solution

1. Step 1: Write the proportion equation
   19,761.91 : 29,388.71 = 19,139.02 : x
2. Step 2: Convert to fraction form
   19,761.91/29,388.71 = 19,139.02/x
3. Step 3: Cross multiply
   19,761.91x = 29,388.71 × 19,139.02
4. Step 4: Simplify right side
   19,761.91x = 562,471,108.46
5. Step 5: Solve for x
   x = 562,471,108.46/19,761.91
6. Step 6: Final answer
   x = 28,462.39