Finding the Fourth Proportional to 42,803.34, 64,146.68 and 20,615.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,803.34 : 64,146.68 = 20,615.10 : x
2. Step 2: Convert to fraction form
   42,803.34/64,146.68 = 20,615.10/x
3. Step 3: Cross multiply
   42,803.34x = 64,146.68 × 20,615.10
4. Step 4: Simplify right side
   42,803.34x = 1,322,390,222.87
5. Step 5: Solve for x
   x = 1,322,390,222.87/42,803.34
6. Step 6: Final answer
   x = 30,894.56