Finding the Fourth Proportional to 12,690.34, 19,035.64 and 5,670.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,690.34 : 19,035.64 = 5,670.72 : x
2. Step 2: Convert to fraction form
   12,690.34/19,035.64 = 5,670.72/x
3. Step 3: Cross multiply
   12,690.34x = 19,035.64 × 5,670.72
4. Step 4: Simplify right side
   12,690.34x = 107,945,784.46
5. Step 5: Solve for x
   x = 107,945,784.46/12,690.34
6. Step 6: Final answer
   x = 8,506.14