Finding the Fourth Proportional to 49,778.78, 74,488.43 and 42,842.45

Step by Step Solution

1. Step 1: Write the proportion equation
   49,778.78 : 74,488.43 = 42,842.45 : x
2. Step 2: Convert to fraction form
   49,778.78/74,488.43 = 42,842.45/x
3. Step 3: Cross multiply
   49,778.78x = 74,488.43 × 42,842.45
4. Step 4: Simplify right side
   49,778.78x = 3,191,267,131.18
5. Step 5: Solve for x
   x = 3,191,267,131.18/49,778.78
6. Step 6: Final answer
   x = 64,108.99