Finding the Fourth Proportional to 20,931.69, 31,364.72 and 17,798.81

Step by Step Solution

1. Step 1: Write the proportion equation
   20,931.69 : 31,364.72 = 17,798.81 : x
2. Step 2: Convert to fraction form
   20,931.69/31,364.72 = 17,798.81/x
3. Step 3: Cross multiply
   20,931.69x = 31,364.72 × 17,798.81
4. Step 4: Simplify right side
   20,931.69x = 558,254,777.55
5. Step 5: Solve for x
   x = 558,254,777.55/20,931.69
6. Step 6: Final answer
   x = 26,670.31