Finding the Fourth Proportional to 42,789.39, 64,199.29 and 19,094.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,789.39 : 64,199.29 = 19,094.78 : x
2. Step 2: Convert to fraction form
   42,789.39/64,199.29 = 19,094.78/x
3. Step 3: Cross multiply
   42,789.39x = 64,199.29 × 19,094.78
4. Step 4: Simplify right side
   42,789.39x = 1,225,871,431.47
5. Step 5: Solve for x
   x = 1,225,871,431.47/42,789.39
6. Step 6: Final answer
   x = 28,648.96