Finding the Fourth Proportional to 28,109.10, 42,175.80 and 14,258.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,109.10 : 42,175.80 = 14,258.10 : x
2. Step 2: Convert to fraction form
   28,109.10/42,175.80 = 14,258.10/x
3. Step 3: Cross multiply
   28,109.10x = 42,175.80 × 14,258.10
4. Step 4: Simplify right side
   28,109.10x = 601,346,773.98
5. Step 5: Solve for x
   x = 601,346,773.98/28,109.10
6. Step 6: Final answer
   x = 21,393.31