Finding the Fourth Proportional to 37,699.56, 56,531.79 and 13,990.59

Step by Step Solution

1. Step 1: Write the proportion equation
   37,699.56 : 56,531.79 = 13,990.59 : x
2. Step 2: Convert to fraction form
   37,699.56/56,531.79 = 13,990.59/x
3. Step 3: Cross multiply
   37,699.56x = 56,531.79 × 13,990.59
4. Step 4: Simplify right side
   37,699.56x = 790,913,095.86
5. Step 5: Solve for x
   x = 790,913,095.86/37,699.56
6. Step 6: Final answer
   x = 20,979.37