Finding the Fourth Proportional to 137,931.56, 205,690.31 and 136,670.37

Step by Step Solution

1. Step 1: Write the proportion equation
   137,931.56 : 205,690.31 = 136,670.37 : x
2. Step 2: Convert to fraction form
   137,931.56/205,690.31 = 136,670.37/x
3. Step 3: Cross multiply
   137,931.56x = 205,690.31 × 136,670.37
4. Step 4: Simplify right side
   137,931.56x = 28,111,770,089.76
5. Step 5: Solve for x
   x = 28,111,770,089.76/137,931.56
6. Step 6: Final answer
   x = 203,809.55