Finding the Fourth Proportional to 140,638.55, 210,930.93 and 42,142.55

Step by Step Solution

1. Step 1: Write the proportion equation
   140,638.55 : 210,930.93 = 42,142.55 : x
2. Step 2: Convert to fraction form
   140,638.55/210,930.93 = 42,142.55/x
3. Step 3: Cross multiply
   140,638.55x = 210,930.93 × 42,142.55
4. Step 4: Simplify right side
   140,638.55x = 8,889,166,209.42
5. Step 5: Solve for x
   x = 8,889,166,209.42/140,638.55
6. Step 6: Final answer
   x = 63,205.76