Finding the Fourth Proportional to 91,488.21, 137,198.39 and 31,499.93

Step by Step Solution

1. Step 1: Write the proportion equation
   91,488.21 : 137,198.39 = 31,499.93 : x
2. Step 2: Convert to fraction form
   91,488.21/137,198.39 = 31,499.93/x
3. Step 3: Cross multiply
   91,488.21x = 137,198.39 × 31,499.93
4. Step 4: Simplify right side
   91,488.21x = 4,321,738,837.62
5. Step 5: Solve for x
   x = 4,321,738,837.62/91,488.21
6. Step 6: Final answer
   x = 47,238.21