Finding the Fourth Proportional to 259,411.84, 389,088.59 and 69,886.21

Step by Step Solution

1. Step 1: Write the proportion equation
   259,411.84 : 389,088.59 = 69,886.21 : x
2. Step 2: Convert to fraction form
   259,411.84/389,088.59 = 69,886.21/x
3. Step 3: Cross multiply
   259,411.84x = 389,088.59 × 69,886.21
4. Step 4: Simplify right side
   259,411.84x = 27,191,926,559.91
5. Step 5: Solve for x
   x = 27,191,926,559.91/259,411.84
6. Step 6: Final answer
   x = 104,821.46