Finding the Fourth Proportional to 99,760.39, 137,672.35 and 56,746.06

Step by Step Solution

1. Step 1: Write the proportion equation
   99,760.39 : 137,672.35 = 56,746.06 : x
2. Step 2: Convert to fraction form
   99,760.39/137,672.35 = 56,746.06/x
3. Step 3: Cross multiply
   99,760.39x = 137,672.35 × 56,746.06
4. Step 4: Simplify right side
   99,760.39x = 7,812,362,947.39
5. Step 5: Solve for x
   x = 7,812,362,947.39/99,760.39
6. Step 6: Final answer
   x = 78,311.27