Finding the Fourth Proportional to 103,790.88, 155,686.43 and 28,911.18

Step by Step Solution

1. Step 1: Write the proportion equation
   103,790.88 : 155,686.43 = 28,911.18 : x
2. Step 2: Convert to fraction form
   103,790.88/155,686.43 = 28,911.18/x
3. Step 3: Cross multiply
   103,790.88x = 155,686.43 × 28,911.18
4. Step 4: Simplify right side
   103,790.88x = 4,501,078,256.73
5. Step 5: Solve for x
   x = 4,501,078,256.73/103,790.88
6. Step 6: Final answer
   x = 43,366.80