Finding the Fourth Proportional to 99,309.89, 137,067.57 and 59,015.87

Step by Step Solution

1. Step 1: Write the proportion equation
   99,309.89 : 137,067.57 = 59,015.87 : x
2. Step 2: Convert to fraction form
   99,309.89/137,067.57 = 59,015.87/x
3. Step 3: Cross multiply
   99,309.89x = 137,067.57 × 59,015.87
4. Step 4: Simplify right side
   99,309.89x = 8,089,161,721.00
5. Step 5: Solve for x
   x = 8,089,161,721.00/99,309.89
6. Step 6: Final answer
   x = 81,453.74