Finding the Fourth Proportional to 99,870.60, 137,822.55 and 54,549.93

Step by Step Solution

1. Step 1: Write the proportion equation
   99,870.60 : 137,822.55 = 54,549.93 : x
2. Step 2: Convert to fraction form
   99,870.60/137,822.55 = 54,549.93/x
3. Step 3: Cross multiply
   99,870.60x = 137,822.55 × 54,549.93
4. Step 4: Simplify right side
   99,870.60x = 7,518,210,454.92
5. Step 5: Solve for x
   x = 7,518,210,454.92/99,870.60
6. Step 6: Final answer
   x = 75,279.52