Finding the Fourth Proportional to 42,687, 64,035.61 and 13,100.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,687 : 64,035.61 = 13,100.96 : x
2. Step 2: Convert to fraction form
   42,687/64,035.61 = 13,100.96/x
3. Step 3: Cross multiply
   42,687x = 64,035.61 × 13,100.96
4. Step 4: Simplify right side
   42,687x = 838,928,092.52
5. Step 5: Solve for x
   x = 838,928,092.52/42,687
6. Step 6: Final answer
   x = 19,653.01