Finding the Fourth Proportional to 42,005.49, 63,080.15 and 28,055.17

Step by Step Solution

1. Step 1: Write the proportion equation
   42,005.49 : 63,080.15 = 28,055.17 : x
2. Step 2: Convert to fraction form
   42,005.49/63,080.15 = 28,055.17/x
3. Step 3: Cross multiply
   42,005.49x = 63,080.15 × 28,055.17
4. Step 4: Simplify right side
   42,005.49x = 1,769,724,331.88
5. Step 5: Solve for x
   x = 1,769,724,331.88/42,005.49
6. Step 6: Final answer
   x = 42,130.79