Finding the Fourth Proportional to 258,513.93, 387,781.33 and 90,051.30

Step by Step Solution

1. Step 1: Write the proportion equation
   258,513.93 : 387,781.33 = 90,051.30 : x
2. Step 2: Convert to fraction form
   258,513.93/387,781.33 = 90,051.30/x
3. Step 3: Cross multiply
   258,513.93x = 387,781.33 × 90,051.30
4. Step 4: Simplify right side
   258,513.93x = 34,920,210,493.07
5. Step 5: Solve for x
   x = 34,920,210,493.07/258,513.93
6. Step 6: Final answer
   x = 135,080.58