Finding the Fourth Proportional to 139,987.98, 210,069.03 and 56,881.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139,987.98 : 210,069.03 = 56,881.98 : x
2. Step 2: Convert to fraction form
   139,987.98/210,069.03 = 56,881.98/x
3. Step 3: Cross multiply
   139,987.98x = 210,069.03 × 56,881.98
4. Step 4: Simplify right side
   139,987.98x = 11,949,142,363.08
5. Step 5: Solve for x
   x = 11,949,142,363.08/139,987.98
6. Step 6: Final answer
   x = 85,358.35