Finding the Fourth Proportional to 28,092.31, 42,166.66 and 13,109.69

Step by Step Solution

1. Step 1: Write the proportion equation
   28,092.31 : 42,166.66 = 13,109.69 : x
2. Step 2: Convert to fraction form
   28,092.31/42,166.66 = 13,109.69/x
3. Step 3: Cross multiply
   28,092.31x = 42,166.66 × 13,109.69
4. Step 4: Simplify right side
   28,092.31x = 552,791,840.94
5. Step 5: Solve for x
   x = 552,791,840.94/28,092.31
6. Step 6: Final answer
   x = 19,677.69