Finding the Fourth Proportional to 31,290.10, 46,935.12 and 12,570.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,290.10 : 46,935.12 = 12,570.12 : x
2. Step 2: Convert to fraction form
   31,290.10/46,935.12 = 12,570.12/x
3. Step 3: Cross multiply
   31,290.10x = 46,935.12 × 12,570.12
4. Step 4: Simplify right side
   31,290.10x = 589,980,090.61
5. Step 5: Solve for x
   x = 589,980,090.61/31,290.10
6. Step 6: Final answer
   x = 18,855.17