Finding the Fourth Proportional to 53,145.61, 79,690.72 and 19,838.28

Step by Step Solution

1. Step 1: Write the proportion equation
   53,145.61 : 79,690.72 = 19,838.28 : x
2. Step 2: Convert to fraction form
   53,145.61/79,690.72 = 19,838.28/x
3. Step 3: Cross multiply
   53,145.61x = 79,690.72 × 19,838.28
4. Step 4: Simplify right side
   53,145.61x = 1,580,926,816.76
5. Step 5: Solve for x
   x = 1,580,926,816.76/53,145.61
6. Step 6: Final answer
   x = 29,747.08