Finding the Fourth Proportional to 19,904.28, 29,856.71 and 5,112.87

Step by Step Solution

1. Step 1: Write the proportion equation
   19,904.28 : 29,856.71 = 5,112.87 : x
2. Step 2: Convert to fraction form
   19,904.28/29,856.71 = 5,112.87/x
3. Step 3: Cross multiply
   19,904.28x = 29,856.71 × 5,112.87
4. Step 4: Simplify right side
   19,904.28x = 152,653,476.86
5. Step 5: Solve for x
   x = 152,653,476.86/19,904.28
6. Step 6: Final answer
   x = 7,669.38