Finding the Fourth Proportional to 42,987.13, 64,516.23 and 21,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,987.13 : 64,516.23 = 21,942.72 : x
2. Step 2: Convert to fraction form
   42,987.13/64,516.23 = 21,942.72/x
3. Step 3: Cross multiply
   42,987.13x = 64,516.23 × 21,942.72
4. Step 4: Simplify right side
   42,987.13x = 1,415,661,570.35
5. Step 5: Solve for x
   x = 1,415,661,570.35/42,987.13
6. Step 6: Final answer
   x = 32,932.22