Finding the Fourth Proportional to 142,642.87, 213,985.18 and 42,810.96

Step by Step Solution

1. Step 1: Write the proportion equation
   142,642.87 : 213,985.18 = 42,810.96 : x
2. Step 2: Convert to fraction form
   142,642.87/213,985.18 = 42,810.96/x
3. Step 3: Cross multiply
   142,642.87x = 213,985.18 × 42,810.96
4. Step 4: Simplify right side
   142,642.87x = 9,160,911,596.72
5. Step 5: Solve for x
   x = 9,160,911,596.72/142,642.87
6. Step 6: Final answer
   x = 64,222.71