Finding the Fourth Proportional to 19,128.78, 28,695.60 and 5,981.94

Step by Step Solution

1. Step 1: Write the proportion equation
   19,128.78 : 28,695.60 = 5,981.94 : x
2. Step 2: Convert to fraction form
   19,128.78/28,695.60 = 5,981.94/x
3. Step 3: Cross multiply
   19,128.78x = 28,695.60 × 5,981.94
4. Step 4: Simplify right side
   19,128.78x = 171,655,357.46
5. Step 5: Solve for x
   x = 171,655,357.46/19,128.78
6. Step 6: Final answer
   x = 8,973.67