Finding the Fourth Proportional to 28,103.32, 42,175.73 and 13,312.23

Step by Step Solution

1. Step 1: Write the proportion equation
   28,103.32 : 42,175.73 = 13,312.23 : x
2. Step 2: Convert to fraction form
   28,103.32/42,175.73 = 13,312.23/x
3. Step 3: Cross multiply
   28,103.32x = 42,175.73 × 13,312.23
4. Step 4: Simplify right side
   28,103.32x = 561,453,018.18
5. Step 5: Solve for x
   x = 561,453,018.18/28,103.32
6. Step 6: Final answer
   x = 19,978.17