Finding the Fourth Proportional to 42,988.96, 64,496.25 and 20,516.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,988.96 : 64,496.25 = 20,516.52 : x
2. Step 2: Convert to fraction form
   42,988.96/64,496.25 = 20,516.52/x
3. Step 3: Cross multiply
   42,988.96x = 64,496.25 × 20,516.52
4. Step 4: Simplify right side
   42,988.96x = 1,323,238,603.05
5. Step 5: Solve for x
   x = 1,323,238,603.05/42,988.96
6. Step 6: Final answer
   x = 30,780.89