Finding the Fourth Proportional to 42,674.78, 64,011.30 and 13,091.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,674.78 : 64,011.30 = 13,091.96 : x
2. Step 2: Convert to fraction form
   42,674.78/64,011.30 = 13,091.96/x
3. Step 3: Cross multiply
   42,674.78x = 64,011.30 × 13,091.96
4. Step 4: Simplify right side
   42,674.78x = 838,033,379.15
5. Step 5: Solve for x
   x = 838,033,379.15/42,674.78
6. Step 6: Final answer
   x = 19,637.67