Finding the Fourth Proportional to 28,300.10, 42,401.55 and 18,434.30

Step by Step Solution

1. Step 1: Write the proportion equation
   28,300.10 : 42,401.55 = 18,434.30 : x
2. Step 2: Convert to fraction form
   28,300.10/42,401.55 = 18,434.30/x
3. Step 3: Cross multiply
   28,300.10x = 42,401.55 × 18,434.30
4. Step 4: Simplify right side
   28,300.10x = 781,642,893.17
5. Step 5: Solve for x
   x = 781,642,893.17/28,300.10
6. Step 6: Final answer
   x = 27,619.79