Finding the Fourth Proportional to 42,157, 63,202.62 and 21,105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   42,157 : 63,202.62 = 21,105.40 : x
2. Step 2: Convert to fraction form
   42,157/63,202.62 = 21,105.40/x
3. Step 3: Cross multiply
   42,157x = 63,202.62 × 21,105.40
4. Step 4: Simplify right side
   42,157x = 1,333,916,576.15
5. Step 5: Solve for x
   x = 1,333,916,576.15/42,157
6. Step 6: Final answer
   x = 31,641.64