Finding the Fourth Proportional to 28,111.83, 42,181.41 and 13,303.11

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.83 : 42,181.41 = 13,303.11 : x
2. Step 2: Convert to fraction form
   28,111.83/42,181.41 = 13,303.11/x
3. Step 3: Cross multiply
   28,111.83x = 42,181.41 × 13,303.11
4. Step 4: Simplify right side
   28,111.83x = 561,143,937.19
5. Step 5: Solve for x
   x = 561,143,937.19/28,111.83
6. Step 6: Final answer
   x = 19,961.13