Finding the Fourth Proportional to 42,678.07, 64,019.60 and 13,096.19

Step by Step Solution

1. Step 1: Write the proportion equation
   42,678.07 : 64,019.60 = 13,096.19 : x
2. Step 2: Convert to fraction form
   42,678.07/64,019.60 = 13,096.19/x
3. Step 3: Cross multiply
   42,678.07x = 64,019.60 × 13,096.19
4. Step 4: Simplify right side
   42,678.07x = 838,412,845.32
5. Step 5: Solve for x
   x = 838,412,845.32/42,678.07
6. Step 6: Final answer
   x = 19,645.05