Finding the Fourth Proportional to 28,100.16, 42,171.01 and 13,309.10

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.16 : 42,171.01 = 13,309.10 : x
2. Step 2: Convert to fraction form
   28,100.16/42,171.01 = 13,309.10/x
3. Step 3: Cross multiply
   28,100.16x = 42,171.01 × 13,309.10
4. Step 4: Simplify right side
   28,100.16x = 561,257,978.34
5. Step 5: Solve for x
   x = 561,257,978.34/28,100.16
6. Step 6: Final answer
   x = 19,973.48