Finding the Fourth Proportional to 28,061.90, 42,101.94 and 18,739.82

Step by Step Solution

1. Step 1: Write the proportion equation
   28,061.90 : 42,101.94 = 18,739.82 : x
2. Step 2: Convert to fraction form
   28,061.90/42,101.94 = 18,739.82/x
3. Step 3: Cross multiply
   28,061.90x = 42,101.94 × 18,739.82
4. Step 4: Simplify right side
   28,061.90x = 788,982,777.25
5. Step 5: Solve for x
   x = 788,982,777.25/28,061.90
6. Step 6: Final answer
   x = 28,115.80