Finding the Fourth Proportional to 28,103.41, 42,175.89 and 13,312.35

Step by Step Solution

1. Step 1: Write the proportion equation
   28,103.41 : 42,175.89 = 13,312.35 : x
2. Step 2: Convert to fraction form
   28,103.41/42,175.89 = 13,312.35/x
3. Step 3: Cross multiply
   28,103.41x = 42,175.89 × 13,312.35
4. Step 4: Simplify right side
   28,103.41x = 561,460,209.24
5. Step 5: Solve for x
   x = 561,460,209.24/28,103.41
6. Step 6: Final answer
   x = 19,978.37