Finding the Fourth Proportional to 42,788.14, 64,182.39 and 28,090.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,788.14 : 64,182.39 = 28,090.06 : x
2. Step 2: Convert to fraction form
   42,788.14/64,182.39 = 28,090.06/x
3. Step 3: Cross multiply
   42,788.14x = 64,182.39 × 28,090.06
4. Step 4: Simplify right side
   42,788.14x = 1,802,887,186.04
5. Step 5: Solve for x
   x = 1,802,887,186.04/42,788.14
6. Step 6: Final answer
   x = 42,135.21