Finding the Fourth Proportional to 42,738.76, 64,115.52 and 19,054.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,738.76 : 64,115.52 = 19,054.72 : x
2. Step 2: Convert to fraction form
   42,738.76/64,115.52 = 19,054.72/x
3. Step 3: Cross multiply
   42,738.76x = 64,115.52 × 19,054.72
4. Step 4: Simplify right side
   42,738.76x = 1,221,703,281.25
5. Step 5: Solve for x
   x = 1,221,703,281.25/42,738.76
6. Step 6: Final answer
   x = 28,585.37