Finding the Fourth Proportional to 102,870.47, 141,645.82 and 90,051.91

Step by Step Solution

1. Step 1: Write the proportion equation
   102,870.47 : 141,645.82 = 90,051.91 : x
2. Step 2: Convert to fraction form
   102,870.47/141,645.82 = 90,051.91/x
3. Step 3: Cross multiply
   102,870.47x = 141,645.82 × 90,051.91
4. Step 4: Simplify right side
   102,870.47x = 12,755,476,634.52
5. Step 5: Solve for x
   x = 12,755,476,634.52/102,870.47
6. Step 6: Final answer
   x = 123,995.51