Finding the Fourth Proportional to 13,130.82, 19,719.72 and 12,602.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,130.82 : 19,719.72 = 12,602.30 : x
2. Step 2: Convert to fraction form
   13,130.82/19,719.72 = 12,602.30/x
3. Step 3: Cross multiply
   13,130.82x = 19,719.72 × 12,602.30
4. Step 4: Simplify right side
   13,130.82x = 248,513,728.76
5. Step 5: Solve for x
   x = 248,513,728.76/13,130.82
6. Step 6: Final answer
   x = 18,925.99