Finding the Fourth Proportional to 99,697.37, 137,590.52 and 56,690.33

Step by Step Solution

1. Step 1: Write the proportion equation
   99,697.37 : 137,590.52 = 56,690.33 : x
2. Step 2: Convert to fraction form
   99,697.37/137,590.52 = 56,690.33/x
3. Step 3: Cross multiply
   99,697.37x = 137,590.52 × 56,690.33
4. Step 4: Simplify right side
   99,697.37x = 7,800,051,012.27
5. Step 5: Solve for x
   x = 7,800,051,012.27/99,697.37
6. Step 6: Final answer
   x = 78,237.28