Finding the Fourth Proportional to 139,925.55, 209,921.13 and 55,690.81

Step by Step Solution

1. Step 1: Write the proportion equation
   139,925.55 : 209,921.13 = 55,690.81 : x
2. Step 2: Convert to fraction form
   139,925.55/209,921.13 = 55,690.81/x
3. Step 3: Cross multiply
   139,925.55x = 209,921.13 × 55,690.81
4. Step 4: Simplify right side
   139,925.55x = 11,690,678,421.82
5. Step 5: Solve for x
   x = 11,690,678,421.82/139,925.55
6. Step 6: Final answer
   x = 83,549.28