Finding the Fourth Proportional to 28,090.01, 42,118.71 and 13,298.80

Step by Step Solution

1. Step 1: Write the proportion equation
   28,090.01 : 42,118.71 = 13,298.80 : x
2. Step 2: Convert to fraction form
   28,090.01/42,118.71 = 13,298.80/x
3. Step 3: Cross multiply
   28,090.01x = 42,118.71 × 13,298.80
4. Step 4: Simplify right side
   28,090.01x = 560,128,300.55
5. Step 5: Solve for x
   x = 560,128,300.55/28,090.01
6. Step 6: Final answer
   x = 19,940.48