Finding the Fourth Proportional to 22,530.39, 31,090.90 and 12,970.59

Step by Step Solution

1. Step 1: Write the proportion equation
   22,530.39 : 31,090.90 = 12,970.59 : x
2. Step 2: Convert to fraction form
   22,530.39/31,090.90 = 12,970.59/x
3. Step 3: Cross multiply
   22,530.39x = 31,090.90 × 12,970.59
4. Step 4: Simplify right side
   22,530.39x = 403,267,316.63
5. Step 5: Solve for x
   x = 403,267,316.63/22,530.39
6. Step 6: Final answer
   x = 17,898.82