Finding the Fourth Proportional to 28,290.42, 42,374.88 and 26,634.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,290.42 : 42,374.88 = 26,634.28 : x
2. Step 2: Convert to fraction form
   28,290.42/42,374.88 = 26,634.28/x
3. Step 3: Cross multiply
   28,290.42x = 42,374.88 × 26,634.28
4. Step 4: Simplify right side
   28,290.42x = 1,128,624,418.89
5. Step 5: Solve for x
   x = 1,128,624,418.89/28,290.42
6. Step 6: Final answer
   x = 39,894.23