Finding the Fourth Proportional to 19,881.89, 29,822.68 and 5,090.78

Step by Step Solution

1. Step 1: Write the proportion equation
   19,881.89 : 29,822.68 = 5,090.78 : x
2. Step 2: Convert to fraction form
   19,881.89/29,822.68 = 5,090.78/x
3. Step 3: Cross multiply
   19,881.89x = 29,822.68 × 5,090.78
4. Step 4: Simplify right side
   19,881.89x = 151,820,702.89
5. Step 5: Solve for x
   x = 151,820,702.89/19,881.89
6. Step 6: Final answer
   x = 7,636.13